以下方法是基類的一部分,它使派生類能夠指定應該由事件通知誰。獲取匿名方法的目標
protected void RaiseEvent<TEventArgs>(EventHandler<TEventArgs> updateEvent, TEventArgs eventArgs, UpdateReceivers updateReceivers)
where TEventArgs : EventArgs
{
EventHandler<TEventArgs> handler = updateEvent;
if (handler != null)
{
if (updateReceivers.ToAllSubscribers)
{
handler(this, eventArgs);
}
else
{
NotifySpecifiedReceiver(handler, eventArgs, updateReceivers.Receiver);
}
}
}
private void NotifySpecifiedReceiver<TEventArgs>(EventHandler<TEventArgs> handler, TEventArgs eventArgs, object updateReceiver)
where TEventArgs : EventArgs
{
foreach (Delegate @delegate in handler.GetInvocationList())
{
// is the delegates target our receiver?
// but this doesnt work for anonymous methods :(
if (@delegate.Target == updateReceiver)
{
try
{
@delegate.DynamicInvoke(this, eventArgs);
}
catch (Exception ex)
{
}
}
}
}
爲了通知僅在特定的接收機中,該方法用於這樣的:(接收器必須被訂閱當然)
event EventHandler<SomethingChangedEventArgs> SomethingChanged;
RaiseEvent(SomethingChanged, args, UpdateReceivers.Single(receiver));
這隻會提高代表「指點」到接收器。
這裏我的問題是,當我使用匿名方法來訂閱SomethingChanged事件時,它不工作,當我使用此事件來通知訂閱它的對象。
class EventConsumer
{
private EventSource _eventSource;
private void SubscribeEvents()
{
// ReactOnEvent() will not be called because the check [@delegate.Target == updateReceiver] doesnt work for anonymous methods
_eventSource.MyStateChanged += (sender, e) => ReactOnEvent();
_eventSource.PublishCurrentState(this);
}
}
class EventSource
{
// multiple objects are subscribed to this event
event EventHandler<MyStateChangedEventArgs> MyStateChanged;
public void GetCurrentState(object receiver)
{
// receiver ask for the current state, only raise event for him
RaiseEvent(MyStateChanged, args, UpdateReceivers.Single(receiver));
}
}
是否有可能獲取包含匿名方法的實例?還是應該使用完全不同的方法來解決我的問題?
你不應該調用'DynamicInvoke'。 – SLaks
是否有另一種方法來調用委託? – leozilla
'@delegate(this,eventArgs)'你只需要'DynamicInvoke'來爲一個無類型的委託。 (它使用反射來調用方法) – SLaks